Question

我在PHP文件中声明了一些全局变量：

var coordinates = [];
var joined_data = [];

变量坐标最初设置为从XMLHttpRequest接收的一些数据， joined_data 设置为等于坐标。稍后，调用一个函数：

function addMarkerToWps(wp_id)
{
    joined_data = coordinates.slice(0, coordinates.length-5);
    calculateRoutes();

}

此简短代码应选择一个子阵列并将其保存到 joined_data ;函数 calculateRoutes 使用Google API在地图上绘制路径;在这样的函数结束时，我尝试显示两个数组的长度，我希望 joined_data 比坐标更短，但我发现它们的大小相同。所以，我怀疑 slice 函数以某种方式失败了。这是函数 calculateRoutes ：

function calculateRoutes()
{
    // remove previous route
    removeRoutes();
    //window.alert('Numero punti ' + coordinates.length);

    // set start position
    //var begin = new google.maps.LatLng(coordinates[0].Lat, coordinates[0].Lon);
    var begin = new google.maps.LatLng(joined_data[0].Lat, joined_data[0].Lon);

    // set end position
    var end = null;

    // waypoints struct
    var waypoints = [];

    // counter
    var wCount = 0;

    // loop
    var i;
    //for(i=1; i<coordinates.length-1; i++)
    for(i=1; i<joined_data.length-1; i++)
    {
        if(wCount === REQUEST_WAYPOINTS_LIMIT)
        {
            // increment counter to get end's index
            i++;

            // set end
            //end = new google.maps.LatLng(coordinates[i].Lat, coordinates[i].Lon);
            end = new google.maps.LatLng(joined_data[i].Lat, joined_data[i].Lon);

            // draw current route
            drawRoute(begin, end, waypoints);

            // update indeces
            begin = end;

            // reset structures
            wCount = 0;
            waypoints = [];
        }

        // add waypoint to list
        waypoints.push
        (
            {
                //location: new google.maps.LatLng(coordinates[i].Lat, coordinates[i].Lon),
                location: new google.maps.LatLng(joined_data[i].Lat, joined_data[i].Lon),
                stopover: true
            }
        );

        // increments counter
        wCount++;
    }

    if(waypoints.length > 0)
    {
        //end = new google.maps.LatLng(coordinates[coordinates.length-1].Lat, coordinates[coordinates.length-1].Lon);
        end = new google.maps.LatLng(joined_data[joined_data.length-1].Lat, joined_data[joined_data.length-1].Lon);
        drawRoute(begin, end, waypoints);
    }

    for(var i = 0; i<coordinates.length; i++)
    {
        placeMarker(coordinates[i].Lat, coordinates[i].Lon, "http://gmaps-samples.googlecode.com/svn/trunk/markers/red/blank.png");
    }

    for(var j = 0; j<interest_points.length; j++)
    {
        placeAttractionMarker(
            interest_points[j].Lat,
            interest_points[j].Lon,
            "http://gmaps-samples.googlecode.com/svn/trunk/markers/orange/blank.png",
            interest_points[j].Name,
            interest_points[j].Wikipedia,
            j

        );
    }

    //joinData();
    //window.alert("" + coordinates.length + " " + interest_points.length + " " + joined_data.length);
    window.alert("" + coordinates.length + " " + joined_data.length);


}

你能发现错误吗？谢谢。

Javascript的切片不起作用

0 个答案: